Question

if the sum of first n terms of an ap is 4n -n sq wht is the first term

Answer 1

4n-n
N=1
Then,
4(1)-1=4-1=3.
a=3

Answer 2

given
Sn=4n-n square

taking n=1
s1= 4×1-1 square
=4-1
=3